How to change Product price of a Cart? [SOLVED]

Question

I created an order using Rest Api and i want to change the Produt Price from a Cart. I tried this:

But didn't work, this line: $quote = $this->quoteFactory->create()->load($resultQuote->quote_id); returns null. What could be? Any help is appreciated.

 $quote = $this->quoteFactory->create()->load($resultQuote->quote_id);
 $items = $quote->getItemsCollection();

 foreach ($items as $item) {

    $item->setPrice(999);
    $item->setRowTotal(999);
    $item->setCustomPrice(999);
    $item->setOriginalPrice(999);
    $item->setOriginalCustomPrice(999);
    $item->getProduct()->setIsSuperMode(true);
    $item->save();
    $quote->save();
 }

 $quote->setTotalsCollectedFlag(false)->collectTotals();
 $quote->save();

Answer 1

I solved this following this tutorial Magento 2 : How to load quote by quote id

looks like the load function is depreciated and doesn't works anymore.